three they doused the glim, which was only an electric torch one of them
carried, and skipped out, locking the door on poor Cadger. It was hours
afterwards when the day watchman came on duty and the discovery
followed."

Frank and Andy had somehow turned, and exchanged a significant look
about this time; and the expression of astonishment on the face of the
latter deepened.

"Did you say an electric torch, Chief?" demanded Frank, immediately.

"Yes, one of the handy kind that are used so commonly now," the other
replied.

"Tell us, did Cadger say anything about the thieves wearing masks over
their faces; or did they use handkerchiefs to hide them from him?"

"I didn't mention that matter, but it was just as you say, Frank; both
men had on masks all the time," answered the police officer.

"Black ones too, I expect?" ventured Andy.

"That's what they were; but see here, are you two just guessing this, or
do you happen to know something about those men?" asked the other,
quickly; for he could not help seeing from the manner of the Bird boys
that they were on some sort of a scent; and he knew from past
experiences that their sagacity could always be trusted to do the right
thing.

"Well," Frank went on to say, drily, "while Andy was watching our new